You can place your rides any way you want but there are a couple of things you should keep in mind when doing so. You need to place your rides in such a way that you don't have two of the same kind of attraction in the same place. When this happens you will find they will not earn their full potential for the park as they will be competing against each other for the same customers, this makes it importatnt that you ensure there is a reasonable gap between the rides so you prevent this from happening. You also need to strategically place your toilets in such a way that customers can access them easily from your rides, when you do this you will increase their satisfaction.